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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4180e08beb9d77d10b7e616d0d3e66e308068486c74c602dad95915da2657c7' 
  AND token = 'eDceUt5r2yZo02UMw2eof8yphlKyMRLTMPeSyoZDnGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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