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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2958b20a00416d09c8e64d5207241f65350b278abec096b8bc95aa3ea845a0' 
  AND token = '5ObfVS+q2xQlR0Y27NJBqctwRXB7YirZJQtB+8Vbleg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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