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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046d427cc6fcf5909563f23212cf21d3ee782c4baa0804576ce2cc71468fb33' 
  AND token = 'wN2u2WvlyWCyMNDfkRI30obfhnmIsFPaZf5dijSwlW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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