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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00d3e8f098cd7474cdeb0977180f90d23fdd16611a257ab1407b2072a6d9b37' 
  AND token = 'h2DeNR1BaIw8ur+aunAvOHV7grQusrBBGxIAy5+OxME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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