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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0305b0b9f4eab0483800544561e6de2cc0143be51d69866d7ca3e1d15855fb13' 
  AND token = 'NSqx3dY2xouzYMQNfvhTWuZnyw8220J1omIbUGVmFPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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