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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cf1a6eb3cc28178319c55970109264bf09452a2166d7a496ac084fdd494f76' 
  AND token = 'IxIti+Cjl8ooSuJdTr7404mHdAV6s4MhUkn1EO31z0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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