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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14be3bc42a519c568861b93466ad73d11ae938b5b3507d741561e84a9238ae64' 
  AND token = 'gRmjQK76R8gMJhownLgLX443nnmYZUWk3Xe7WGF4t1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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