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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e304d1dd0fd604c8d02b9db382282983af76afca8d90b7adffc54ef4e7407ea' 
  AND token = 'uI5nvN2FxziDJR6QMjGEh48Ab6cypeFfps/yKuMA4UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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