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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa9b996d0cf8ad2ce24454080cb4887041646f58a4d47103b39f0284b29f832' 
  AND token = '0tXXi2W9tLvwM3HtHaY64loQcMcR3kDh3gOp73LExqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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