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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8ed2d9be4b7f90dd833b2a6f78d8f590ed9a4ce1bfa10aae28c41c41b8dddd' 
  AND token = 'hkFaJ3PsuFzLSou5Mi5tPcg6X5O1MDnfPGnWosx/cXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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