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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fe2ecec24be7b5f33dd42b7fd7b14c0901988fa650afaf83c85a9aec37d06d' 
  AND token = '405zHKbFknxD51pW4zsQ6tykxuKwA8guy/QOBTwrNZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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