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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b676a6a8b86d97a603427163e62660051a62db62871e7ee8abdeb9427b413fb9' 
  AND token = 'kn5AsPlPaxEv3/Cz47MftyJ1b6xDg6ZOrELm2HkTivQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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