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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546957b20ca143da554ef471a918f180b72da5f4c124b6575f385e7a12c71e78' 
  AND token = '+sH8kfGCd3kzyipslvEDxB/CXAgbL502H0ovufBAM9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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