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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d264ee9d64e5b07105c473c339c6f2c17b902070562382f0e8ab93dd62de2de' 
  AND token = 'yQwolkSZuFs0MDDDy8eU3cVAg1crcdqw+3XTAPg4FRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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