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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03283fee62a64b0b5571e039622f38a75b9bbb95d5fff3a3c12d7c4449f47e9c' 
  AND token = 'FdwMaowj7wcOVHKfb9AJIcXc+ifpl08zK++vgUxS8a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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