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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bd94298735c0af889b5cd7dce7867360db863cc8421fdf7ef92f35949d6e56' 
  AND token = 'nw6mUdanllQs8y8DiG309Hyv2rmT1uqXQSndNzw2FkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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