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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829179f1f329250e7553ff67300d88109740330ec4d333da5cb75e9c8f1d17fb' 
  AND token = 'dbmuUcWrbYD/8PrQi6i7KRaCl6CVQEljGXfiASkuPL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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