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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77852c93ca4ef70cd1eb8ee124a6542f35793659c51117db3c2494bd8c464165' 
  AND token = '11iamOtF7EkC3nS/SARC4H/VQiFpWd/gNxs6NFPRak0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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