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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82eb91722f69ae7b9df9c1eb985942144b37c971f99050422e267d6f24bd91e4' 
  AND token = 'dO9g3Z/hWtU1b2bjQ4qQGm2Tr96qAKBFlS8paedWqFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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