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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f959aa3742ffa764a1511af4f961469aa639c947adff385b316c477d95b789b3' 
  AND token = '7eBI3qRpd4eiHgxDJGgXoN/9PfnDuN50Coz5phFPlc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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