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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d536181b906c9540517fd39766ffab712c492cebd2bdf7e1bd10d80deeeae1' 
  AND token = 'GANXYXFyfxhXjdTazMst9Xig84+iJauFchPj/lOXiGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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