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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5549e6c60dc753c4c72b82582e65b2d3dd72bf86b835850a57ccaaa1341676a8' 
  AND token = 'iJ7uTjXCcxpJfpsoqgssYcYFhfGM4n1SEd8jY5niCs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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