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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb8f0b760d7ecdb45d2db594e74216722a9b1e913cb499a8bbf39aef05ea508' 
  AND token = 'x1nGfcb5S9WHyFpI023GgvqQ2irWNojLLQKn0n+0agk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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