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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f03f2e6a057448ae59af4ec6e6a6f52d46ddaa86c779caba3d1b360526e320' 
  AND token = 'k5rNF3RZTRLDQcAEsn1EXLqq8veN79U+h49E3nmQshg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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