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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec83b5e8d6ebf39cf374035942583ba4ca176637caa606bd844ccca1a54ec8f' 
  AND token = 'fp1u3Ry8ssODDo1hO9KV/PVBE6tojXo3bQZRo4Z8szk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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