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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41d87bbe984460feb5a84013b81b8b9a13b9b437ce7d45117c36dc3ebb84776' 
  AND token = '2flHUizCpL7WQRa23MxegT5S8DYF0DHS6IfctvN3Jh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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