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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34d34a932f8282ead16ee5bdff52e4ab99437fc4eb191207afd1c1e4c3dd17d' 
  AND token = 'mkUeNaF07ZKr/BuT5g4Bmxdt8wp+A2okmlSurcGgIP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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