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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e807633296c3116725974e4c616e5420ddbfe75999f8589922b074e70a9f5363' 
  AND token = 'Cv6fI3ri4pCJEqpi4wwwYEeSZYpeXbBLp59/TnHmzck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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