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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796e8423d8289c3e163bc2ed8371450348b6747edb09dd6685d55eb75b3b75cf' 
  AND token = '7rngZJGmiNERKkzSrErld6Gbpc8SSY5HUWK3yyi7g8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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