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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d75692de1546019f419d472a3aa7799fc756208bbfe7e7fd9aa232543424629' 
  AND token = '5pi54pzzqPPZbNDQFF2aOl/UTmDnIgqOK/i/cfbRwK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}