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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e502ba726633782701244455821cd8767fbe2d0e61450c4b1fccfcbe34503e' 
  AND token = 'xQNZMDcbiXjye/enWgqZ31vG3hUsHotoIz8BnCD+xRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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