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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1825ffd84c6712a98559d5e0616996497d33d377e84513f16de7331f4de108' 
  AND token = 'daSpOBZtnksqzA8bhv3qa9RRkmV0OllLLTz+9zJPhu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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