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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44732be2f159fff94e48f3ecc59683a06a15540bff6e63eb49bd64710da44811' 
  AND token = 'sKEi7lBt7Z7d5WXabJdP7iBuJRV1IREQ4fCD81Xq0fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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