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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fefb5d470344d8fe8aeb80ebc166d1de2b5b63c6f4ec14a49c09be631d8bef1' 
  AND token = 'REXLz4wUMwo2tVc9CAY1BiWIbgRSIVOMH47Sz22aBVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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