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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac48334bc9934c1f3e6202fed9ac8af7089498f2b747680c9b3642c96203d15' 
  AND token = 'nyMvQTmF0+F5OECsXqC1d7X2qYZC+P+q83nm7H2ovuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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