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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c9102923bcd22f032f195ee419031da20f3498ad8efe8480f66e008b4e0679' 
  AND token = '2C4m2JvIL17DiEgz1HLlQrnkTGO7NjLYy0riMK6BhKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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