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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f57660e35a22efdc47a29b19ad381d4c6747ccfc805fa8d9d4b69416e77d86' 
  AND token = 'izAJ+tqpEf9HOKX6+EavNsOcQNYP899URFoEAmdQQHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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