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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3870e48516e0d92459118dea478824460f101d698c401089a2d41d9ee0e7b70' 
  AND token = '5HofXx72leKob3P9FZnKTQ00wmxCQg+481Brs1tOc/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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