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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce997340a8f683e2ac3585b3349a16197021b52915f00114078ad0e3401af7' 
  AND token = '/zDzdW2LczSltbLLNq4Ef1Ch85xeG12C5ZND8E+nGuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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