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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e727e9b0a729fe9bb048a7105f929ab73fff50e208e4b12b6699cd66d7a3c0d' 
  AND token = 'ovQGQmT7khXpgmUVvNwpreS8+w1j/SazS1NMd72OUaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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