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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7c7171663c5155dcd2592eec4d9390c6bd48e20780b822b0d8264b45695e21' 
  AND token = 'zsEhpd6JycAIsUQ5l/6msTnvpWLqrE1USQ/o7M9x9J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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