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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fa93c06031970eae418d3b3269cbda3d3b54e183893f713ea2f159756c17f3' 
  AND token = '71T19VscCl+unfdaSvTG0wQ2av8jM0Zs30toMWMy35Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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