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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2101e551b86d6c506d2c675ae66f7591e099e3352dc5153b27785fac79aa1bd6' 
  AND token = '1MhZG/laqaovxS1LZrbij8QQzqVvj0aZyaD+wJXw5Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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