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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461aa3244d7b7ca3cc285232585e22a0125acb45934b2ef45da7c3c7cce69fb0' 
  AND token = '/pgj5sjh7KQNcEBCXiDxcGtX33i20GVkyi8WxyqTV4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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