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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66edce73fc87d5d2722beb29987d48836b0c683c078a6c61dd435b058d62b1c7' 
  AND token = 'idsDne82oMuUoKAHK7Q2kamqKGNLaYcsb5l6ZqwWMPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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