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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c587efba30706fcd997ba1bbc3897f483f8747cf0b2de7cc239435c91906cc76' 
  AND token = 'Qn5Jky6qVCoIU6EDH8OHjEak+czC71coKyRAvDoM/7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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