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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebebddbf63041fe74086429606d5b66e43c3f134a7da33c2a28c28b015433038' 
  AND token = 'rNHEJ70w05Nis8pAMD+iaB2h3DWsb/Q/RUsiAEowgw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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