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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee47d222af82245f992b46750ab9fe5fa746f31a75e10b8062918d40246aa44d' 
  AND token = 'i4L1At7/cfk6aPf1ThLoIy4PQoVnYowo7gafTzH88eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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