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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501f9bffae3c5a772fb5732cd17faacc2c3db4b366485ed75d58bc0908b17e4c' 
  AND token = '9E33/jbnS4mPzkXb5d1TZXd/C7Vp4j2/dgk6wawwKPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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