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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba717ed7954bdea4a18fae72c6c95e0538aa44e809586c26420a1382cec8ca0b' 
  AND token = 'QEzvQOc35LG0ttQ347mMCgPxgw7LObX+Yp/4zrgbBmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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