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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b347051d4b63c6eb34ec4fd4445d2a44efdfc8cf0fb7a06f426d51618c926a' 
  AND token = 'WDpwJ5jnhfU11O7FN4/Gg9YYxbi04L8W6BPnYEUjWIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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