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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2f4f6536b3d0613f82b37a9dae767827f7dd66bb6f2883ea8a1cb67397a2dc' 
  AND token = '3Gn5Dqa7Sj7NjaSFFNWLI9ahCPR+HLygBoAnJsHpawY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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