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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c7fee29d12ff99c785463c42ceb87f571c10f557cfc66356ad5f7f26c39a83' 
  AND token = 'H1xc6/VNl0vRrlR78SZgV0pOhKcXvDemiQfOl0i0nkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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