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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc015d56e9261b9170259d18f756e26ee7e786f931dd47734a6a00e12955fa3b' 
  AND token = '0+0g7mXCzkvtW9xzKgg5J3y4C/qhU7D7w1kROvwQsIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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