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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60d8138d0af20569456c519bc4cbb97b86ffd8303f6b48bab7c30aaae61e67b' 
  AND token = '4zKvu1Kcu2luA7vXo9b8evxh56SflmR4dK30g8kuRDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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