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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bd685a30f85a485522f86fc00f5c8f686f582768bf48be109fe22252f6e909' 
  AND token = 'pXfqByqRVzLt3yaCNPgAhhsGGcLjxGPV/GxCrW9lTNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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